Apparatus for removing a contaminant from a solvent separation process
US8696871B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2010 |
| Grant date | Apr 15, 2014 |
| Priority date | — |
| Expiry date | Feb 2, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC10G21/28
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention is a process and apparatus for removing a contaminant from an aromatic selective solvent. A feed stream comprising an aromatic hydrocarbon and a non-aromatic hydrocarbon is contacted with the aromatic selective solvent in an extractive distillation zone to produce a raffinate stream comprising the non-aromatic hydrocarbon, and a rich solvent stream comprising the aromatic hydrocarbon and the solvent. The rich solvent stream is separated in a second distillation zone to produce an extract stream comprising the aromatic hydrocarbon, and a lean solvent stream comprising the contaminant and the aromatic selective solvent. At least a portion of the lean solvent stream is washed with a non-aromatic hydrocarbon to produce a clean solvent stream, at least a portion of which is passed to at least one of the extractive distillation zone and the second distillation zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.